diff -r 151f4ccd7673 -r bb1e59f5cff3 rt/vm/src/main/java/org/apidesign/vm4brwsr/VM.java
--- a/rt/vm/src/main/java/org/apidesign/vm4brwsr/VM.java	Thu Mar 21 18:48:46 2013 +0100
+++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/VM.java	Sat Oct 05 07:23:48 2013 +0200
@@ -61,11 +61,15 @@
         out.append("(function VM(global) {var fillInVMSkeleton = function(vm) {");
         StringArray processed = new StringArray();
         StringArray initCode = new StringArray();
+        StringArray skipClass = new StringArray();
         for (String baseClass : names.toArray()) {
             references.add(baseClass);
             for (;;) {
                 String name = null;
                 for (String n : references.toArray()) {
+                    if (skipClass.contains(n)) {
+                        continue;
+                    }
                     if (processed.contains(n)) {
                         continue;
                     }
@@ -76,7 +80,8 @@
                 }
                 InputStream is = loadClass(l, name);
                 if (is == null) {
-                    throw new IOException("Can't find class " + name); 
+                    skipClass.add(name);
+                    continue;
                 }
                 try {
                     String ic = compile(is);